Chapter8 - Volcanic Activity 8 Mt Unzen, 1991 Japan has 19...

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Unformatted text preview: Volcanic Activity 8 Mt Unzen, 1991 Japan has 19 active volcanoes. One of these, Mt Unzen erupted 200 years ago killing 15,000 people. 200 years later, it erupted again, but authorities had issued warnings and lives were spared Harry Glicken was one of the scientists who was killed in the Mt Unzen eruption having escaped the Mount St Helens eruption in 1980 Volcanic Hazards 50-60 volcanoes erupt every year; 2-3 eruptions occur in United States (mostly Alaska) each year In the past 100 years 100,00 people have been killed Countries with volcanic hazards include Japan, Mexico, Phillipines, Indonesia and U.S (Alaska, Hawaii, Pacific Northwest) Volcanism and Volcanoes Directly related to plate tectonics As spreading/sinking lithosphere interacts with earth materials, magma or molten rock with water vapor and carbon dioxide is produced Magma emerging from the earth onto surface is called lava Two thirds of the volcanoes are located in the Ring of Fire in the Pacific Ocean Types of Volcanoes Shield Composite or stratovolcano Volcanic Dome Cinder cone Largest volcanoes; commonly found in Iceland, Indian Ocean, tallest...
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Chapter8 - Volcanic Activity 8 Mt Unzen, 1991 Japan has 19...

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